Story: Irrigation and drainage All images & media From page 1 – Regional characteristics Rakaia River New Zealand annual rainfall Irrigated land Soil drainage From page 2 – Beginnings of irrigation Gold sluicing Irrigation channels Bob Semple in an irrigation pipe (1st of 3) Rangitātā diversion race intake (2nd of 3) Rangitātā diversion race (3rd of 3) From page 3 – The post-war period Winchmore Irrigation Research Station Border dyke irrigation system From page 4 – Irrigation after 2000 Irrigated and non-irrigated pasture (1st of 2) Projected land use with and without irrigation (2nd of 2) Dam water storage Waitaki irrigation scheme Centre pivot spray irrigation From page 5 – Irrigation and the environment Recreational use of water Dairy cows and nitrate leaching Lysimeters From page 6 – Irrigation methods Wild flooding Border dyke irrigation Traversing irrigation unit (1st of 3) K-line irrigation (2nd of 3) Moving irrigation unit (3rd of 3) Drip irrigation Measuring soil moisture From page 7 – Drainage Open drains Graded banks Tile drains Wetlands
